Round Plastic Bobbin Coils

Precision Bobbin Coils — Custom OEM/ODM Manufacturing

Custom round plastic bobbin coils manufactured with molded bobbins, mounting flanges, terminals, and lead options, featuring stable winding structure, reliable insulation, and OEM/ODM customization based on drawings or samples.

Winding MaterialCopper / Enameled / Litz / Aluminum / Flat / Self-bonding / etc

Winding Precision± 0.01mm

Winding TurnsCustomizable (1T – 10,000T)

Minimum Order QtyCustomizable

Lead Time7–15 business days

Payment TermsT/T, L/C, Western Union

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Typically responds within 24 hours · Free samples available

30+ Years Experience

ISO Certified Factory

Shipped to 30+ Countries

Round Plastic Bobbin Coils are precision-wound electromagnetic coil assemblies built on circular plastic or engineered bobbins to provide stable winding support, reliable insulation, and convenient installation. Their round bobbin structure can include mounting holes, flanges, pins, lead wires, terminal clips, and custom assembly features to match different product designs.

WIRESUN manufactures round plastic bobbin coils according to customer drawings, samples, or electrical specifications. Bobbin diameter, inner hole size, bobbin height, wire diameter, winding turns, resistance, inductance, rated voltage, insulation grade, terminal type, and mounting structure can all be customized. These coils are suitable for sensors, solenoids, actuators, relays, transformers, industrial control systems, automotive electronics, medical devices, home appliances, and custom electronic modules. Prototype development, sample validation, and mass production are available for OEM/ODM projects.

Applications

Smartphones & 3C Electronics

Automotive Electronics

Industrial Sensors

Precision Instruments

Audio Equipment

Wireless Charging

Item	Specification
Product Name	Round Plastic Bobbin Coils
Coil Type	Round bobbin coil / Plastic bobbin coil / Electromagnetic coil / Custom wound coil assembly
Application	Sensors, solenoids, actuators, relays, transformers, industrial control systems, automotive electronics, medical devices, home appliances
Wire Material	Enameled copper wire, aluminum wire, Litz wire, or custom specified material
Wire Diameter	Customizable according to drawing or sample
Bobbin Material	Plastic bobbin, heat-resistant plastic, engineered resin, nylon, PBT, or custom specified material
Bobbin Shape	Round, circular, flanged, ring-shaped, multi-hole, or custom bobbin structure
Bobbin Size	Customizable based on drawings, samples, or assembly requirements
Mounting Structure	Mounting holes, flange, base plate, terminal seat, or custom installation design
Winding Turns	Customizable
Resistance	Customized to customer specification
Inductance	Customized to customer specification
Rated Voltage	Customized according to application requirements
Terminal Type	Pin terminal, lead wire, soldering terminal, metal clip, PCB terminal, or custom terminal design
Insulation Grade	Customized according to voltage, temperature, and operating environment
Quality Control	Appearance inspection, dimension check, resistance test, inductance test, insulation test, continuity test, and batch inspection
Production Type	OEM / ODM / drawing-based custom manufacturing
Sample Support	Available

Our standard MOQ is 500 pcs for most coil types. For first-time customers or prototype evaluation, we accept small trial orders of 10-50 pcs. MOQ may vary by product complexity. Contact us for a specific quote.

Yes. Samples are available within 5-7 business days after engineering confirmation. A nominal sample fee applies, which is credited toward your first mass production order.

You can email drawings such as PDF, DWG, or STEP files, or fill out our inquiry form. If you do not have drawings, a written description or physical sample is also acceptable.

We can wind wire as fine as 0.01mm using Zongheng CNC precision winding machines with automated tension control.

Yes. Our special-shaped coil series handles non-circular and irregular geometries. Submit your drawings and our engineering team will assess feasibility.

Standard options include bare copper wire, enameled copper wire, and Litz wire. Custom alloy or coated wire options are available on request.

Yes. Provide your target inductance, frequency, and DC resistance requirements, and we will calculate and wind to specification.

WIRESUN is ISO 9001 certified. Products can ship with test reports and COA. Third-party inspection can be arranged upon request.

All coils are wound on CNC machines with precision control. Each production batch undergoes electrical testing, including inductance, DCR, and impedance checks.

Standard documentation includes packing list, commercial invoice, Certificate of Analysis, and electrical test report. RoHS/REACH documents are available upon request.

We ship worldwide. Regular destinations include Southeast Asia, Europe, the Americas, the Middle East, and Russia. Express and sea freight options are available.

Standard terms are 30% T/T deposit upon order confirmation and 70% balance before shipment. L/C is accepted for larger orders, and Western Union is available for sample fees.

Standard products usually take 15-20 business days. Complex custom coils generally take 20-30 business days. Final lead time is confirmed at quotation stage.